A day after President Barack Obama outlined a strategy to combat Islamic State militants, Washington's international allies didn't make clear how far they would go to join military operations even as they pledged their support.

Mr. Obama vowed to "degrade and ultimately destroy" the extremist group which has grabbed territory across Iraq and Syria and harbors ambitions for more. After a day of consulting with Secretary of State John Kerry in Saudi Arabia, most of Iraq's neighbors signed onto a statement of support....

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